chore: audit remarks

[dorimedini-starkware]

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[cursor]

PR Summary

Low Risk
Low risk: behavior change is minimal (a default class hash is now explicitly recorded), with the rest being comments/TODOs only.

Overview
Tightens revert bookkeeping during contract deployment by explicitly recording ClassHash::default() in EntryPointRevertInfo instead of reusing current_class_hash.

Adds audit TODOs documenting potential improvements/ambiguity around clearing events/L2→L1 messages on failed inner calls and the commit-vs-fee-check ordering in L1 handler execution.

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• Started at 2026-05-07T13:28:16Z